Method for determining channel quality indicator cqi index, user equipment, and base station

A method, comprising:

• determining, by a user equipment (UE), a quality of a channel between the UE and a base station;
• sending, by the UE, a first index to the base station according to the quality of the channel, wherein the first index is a channel quality indicator (CQI) index corresponding to an average transmission rate supported by the channel;
• and
• after sending the first index, sending, by the UE, an index difference to the base station according to the quality of the channel;
• wherein a second index can be determined by the base station according to the first index and the index difference;
• and
• wherein the index difference indicates a difference between the first index and the second index, the second index is a CQI index corresponding to an instant transmission rate supported by the channel, a period for sending the first index by the UE is longer than a period for sending the index difference by the UE, and a quantity of bits occupied by the index difference is less than a quantity of bits occupied by the first index.

A method, comprising:

• receiving, by a base station, a first index sent by a user equipment (UE), wherein the first index is a channel quality indicator (CQI) index corresponding to an average transmission rate supported by a channel between the base station and the UE;
• receiving, by the base station, an index difference sent by the UE, wherein the index difference indicates a difference between the first index and a second index, wherein the second index is a CQI index corresponding to an instant transmission rate supported by the channel, a period for sending the first index by the UE is longer than a period for sending the index difference by the UE, and a quantity of bits occupied by the index difference is less than a quantity of bits occupied by the first index;
• and
• determining, by the base station, a CQI index corresponding to the channel, according to the first index and the index difference.

A user equipment (UE), comprising:

• a processor;
• a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to determine a quality of a channel between the UE and a base station;
• and
• a transceiver, configured to:
• send a first index to the base station according to the quality of the channel, wherein the first index is a CQI index corresponding to an average transmission rate supported by the channel;
• and
• after sending the first index, send an index difference to the base station according to the quality of the channel, wherein the base station can determine a second index according to the first index and the index difference;
• wherein the index difference indicates a difference between the first index and the second index, the second index is a CQI index corresponding to an instant transmission rate supported by the channel, a period for sending the first index by the UE is longer than a period for sending the index difference by the UE, and a quantity of bits occupied by the index difference is less than a quantity of bits occupied by the first index.

A base station, comprising:

• a transceiver, configured to:
• receive a first index sent by a user equipment (UE), wherein the first index is a CQI index corresponding to an average transmission rate supported by a channel between the base station and the UE;
• and
• receive an index difference sent by the UE, wherein the index difference indicates a difference between the first index and a second index, the second index is a CQI index corresponding to an instant transmission rate supported by the channel, a period for sending the first index by the UE is longer than a period for sending the index difference by the UE, and a quantity of bits occupied by the index difference is less than a quantity of bits occupied by the first index;
• a processor;
• and
• a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions determine, according to the first index and the index difference, a CQI index corresponding to the channel.